Software Update to Support “Join Domain” Migration of Windows Small Business Server 2003 Data and Settings to New Hardware.

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From KB943494;

SYMPTOMS

The software license terms for Windows SBS enforce a limitation that permits the presence of only one Windows SBS Domain Controller in domain. However, the software license terms allow for a grace period that makes it not possible to complete the process of migrating data and settings in “join domain” type migration scenarios.
This software update extends the allowable grace period for the supported scenarios from 7 days to 21 days.

You can download the patch from here.